The sound file has to be in .wav format and have the exact same name as the poi file you downloaded with the .wav extension. (It has to be in the same directory as the poi file) then load to the GPS using poi loader.

I think the question was how to get rid of the damn "ding ding" and replace them with a acceptable voice like "red light camera ahead"
If somebody now how to do that it would be nice to have that here in this section written down.
Thanks in advance from me too